It provides a allowed? method which you can use to ask an object if the current user is allowed to see the content.

So I quickly put together show_for_stonewall which will limit the display of certain fields if stonewall prevents it. It was as simple as using alias_method_chain to check that an attribute is not allowed

!allowed?(@object, current_user, attribute_name)

You can edit your show_for translation yaml and add a redacted key for the content to display if a field is not allowed for the current user.